implem不是抽象和在延伸的接口不覆蓋抽象方法FinalScore（）

Question

程序1

interface java{ 
    public void setHomeTeam(String name); 
    public void setVisitingTeam(String name); 
} 

程序2

interface extension extends java { 
    public String HomeTeamScored(); 
    public String VisitingTeamScored(); 
    public String FinalScore(); 
} 

程序3

public class implem implements extension{ 
    private String Home; 
    private String Visit; 

    public String HomeTeamScored(){ 
     return Home; 
    } 

    public String VisitingTeamScored(){ 
     return Visit; 
    } 

    public void setHome(String Home){ 
     this.Home = Home; 
    } 

    public void setVisit(String Visit){ 
     this.Visit = Visit; 
    } 
} 

程序4

public class compilation{ 
    public static void main(String [] args){ 
     implem implement = new implem(); 

     implement.setHome("Nihon"); 
     implement.setVisit("Chuugoku"); 

     System.out.println(""+implement.HomeTeamScored()); 
     System.out.println(""+implement.VisitingTeamScored()); 
    } 
} 

這些都是我的延長接口程序，而且我得到的錯誤：

implem is not abstract and does not override abstract method FinalScore() in extension public class implem implements extension{ ^ 1 error

Process completed.

Answer 1

你可以找到一個Java的接口的定義[site]

它說

If your class claims to implement an interface, all methods defined by that interface must appear in its source code before the class will successfully compile

所以，你implem類必須實現從Java中所有接口的方法和它的子類擴展。

你implem類必須遵循該規則，以便它看起來像如下，

public class implem implements extension { 
    private String Home; 
    private String Visit; 

    @Override 
    public String HomeTeamScored() { 
     return Home; 
    } 

    @Override 
    public String VisitingTeamScored() { 
     return Visit; 
    } 

    @Override 
    public void setHomeTeam(String name) { 

    } 

    public void setHome(String Home) { 
     this.Home = Home; 
    } 

    public void setVisit(String Visit) { 
     this.Visit = Visit; 
    } 

    @Override 
    public void setVisitingTeam(String name) { 

    } 

    @Override 
    public String FinalScore() { 

     return null; 
    } 
} 

Answer 2

因爲要實現「擴展」你需要實現所有的接口，你需要添加

Public String FinalScore(); 

方法

致你的課

Answer 3

你的非抽象類實現沒有實現所有的接口方法。 Public String FinalScore()就是這樣一種方法。